CN212005316U - Backlight lamp box - Google Patents
Backlight lamp box Download PDFInfo
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- CN212005316U CN212005316U CN202020715099.4U CN202020715099U CN212005316U CN 212005316 U CN212005316 U CN 212005316U CN 202020715099 U CN202020715099 U CN 202020715099U CN 212005316 U CN212005316 U CN 212005316U
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- backlight
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- light bar
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Abstract
The utility model discloses a lamp house in a poor light, include: a back plate; a light-equalizing diffusion plate arranged opposite to the back plate; the side wall plate surrounds the back plate and the light-equalizing diffusion plate, a side light bar is arranged on one side of the side wall plate close to the back plate, and a back light bar is arranged on one side of the back plate facing the light-equalizing diffusion plate; a brightness sensor; a compensation circuit comprising a digital comparator and a controller; and a backlight power supply; the brightness sensor is arranged on one side, far away from the side light bar, of the side wall plate, the brightness sensor is used for detecting the brightness of light beams emitted by the backlight lamp box and outputting brightness voltage, the digital comparator is used for outputting control voltage when the reference voltage is higher than the brightness voltage, and the controller responds to the control voltage to control the backlight power supply to respectively improve the brightness of the back light bar and the side light bar. The utility model provides a lamp house in a poor light can improve the luminance and the homogeneity of light beam.
Description
Technical Field
The utility model relates to a light source technical field. And more particularly, to a backlight lamp box.
Background
With the reduction of energy sources and the continuous rising of electricity charge price, the concept of energy saving of people is also continuously strengthened, and in order to save cost and reduce operation expenditure, the LED replaces the traditional fluorescent tube. LEDs have several advantages: high luminous efficiency, long service life, wide color temperature range, high display index, no ultraviolet radiation, no harmful substances, etc.
At present, most of light beams emitted by the backlight lamp box in the prior art have low brightness, and with the continuous development of science and technology, the requirements of image processing on the backlight lamp box are higher and higher in the aspect of detecting a liquid crystal module, and the existing backlight lamp box cannot meet the performance requirements.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem who proposes among the background art, the utility model provides a lamp house in a poor light, include:
a back plate;
the light-equalizing diffusion plate is arranged opposite to the back plate;
the side wall plates surround the back plate and the light-homogenizing diffusion plate, side light bars are arranged on one side, close to the back plate, of the side wall plates, and back light bars are arranged on one side, facing the light-homogenizing diffusion plate, of the back plate;
a brightness sensor;
a compensation circuit comprising a digital comparator and a controller; and
a backlight power supply;
the digital comparator is provided with a first input end, a second input end and an output end, the first input end is used for receiving a reference voltage, the second input end is connected with the brightness sensor to receive the brightness voltage, the output end is used for outputting a control voltage when the reference voltage is higher than the brightness voltage, and the controller responds to the control voltage to control the backlight power supply to respectively improve the brightness of the back light bar and the side light bar.
Optionally, the method further comprises:
the alarm device is electrically connected with the controller;
wherein the controller responds to the control voltage to control the alarm device to alarm.
Alternatively,
the controller comprises an MCU singlechip.
Optionally, a power supply line is also included;
wherein, be provided with the power supply line hole on the backplate, the power supply line passes the power supply line hole respectively with lateral part lamp strip and back lamp strip electricity is connected.
Alternatively,
and a heat dissipation plate is arranged on one side of the back plate, which is deviated from the light-equalizing diffusion plate.
Alternatively,
the side wall plate is provided with a clamping groove, and the light-equalizing diffusion plate is clamped with the side wall plate through the clamping groove.
Alternatively,
and the side wall plate is provided with a heat dissipation groove.
Alternatively,
the side light bars are fixedly connected with the side wall plates through heat conducting adhesive tapes.
Alternatively,
the side light bar includes:
a side substrate; and
and the side lamp beads are arranged on the side substrate.
Alternatively,
the back light bar includes:
a back substrate; and
and the plurality of back lamp beads are arranged on the back substrate.
The utility model has the advantages as follows:
the technical solution of the present invention has the advantages of clear principle and simple design, the backlight lamp box provided by the embodiment of the present invention can improve the brightness and uniformity of the light beam, in the specific using process, on one hand, the purpose of increasing the brightness around the backlight lamp box by arranging the corresponding side light bar on the side wall plate is achieved, so that the brightness around the backlight lamp box is close to the brightness of the central position, the light beam emitted by the back light bar and the side light bar is irradiated out through the uniform light diffusion plate, so that the light beam is more uniform, and the purpose of increasing the uniformity of the light beam is achieved, on the other hand, the brightness of the backlight lamp box is correspondingly adjusted through the corresponding coordination among the arranged brightness sensor, the backlight power supply and the compensation circuit, so as to ensure that the brightness of the backlight lamp box is within the preset brightness range, and correspondingly improve the brightness of the backlight lamp, the performance of the backlight lamp box is further improved, and the backlight lamp box has wide application scenes.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of a backlight lamp box according to an embodiment of the present invention; .
Fig. 2 shows an exploded view of a backlight lamp box according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a structure of a compensation circuit in a backlight box according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a side wall plate in a backlight box according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a side light bar in a backlight box according to an embodiment of the present invention;
fig. 6 shows a schematic structural diagram of a back light bar in a backlight box according to an embodiment of the present invention.
In the figure: 100. a back plate; 110. a back light bar; 111. a back substrate; 112. a back lamp bead; 113. a substrate screw hole; 120. a back plate screw hole; 130. a power supply wire hole; 200. a light-equalizing diffusion plate; 300. a side wall panel; 310. a side light bar; 311. a side substrate; 312. a side lamp bead; 320. a sidewall screw hole; 330. a card slot; 340. a heat sink; 400. a heat dissipation plate; 410. a heat-dissipating screw hole; 500. a brightness sensor; 600. a controller; 700. a backlight power supply; 800. and an alarm device.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe the embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a backlight lamp box provided by an embodiment of the present invention, as shown in fig. 1, the backlight lamp box includes: a back plate 100; a light-equalizing diffusion plate 200 disposed opposite to the back plate 100; and a sidewall plate 300 surrounding the back plate 100 and the light-equalizing and diffusing plate 200.
Specifically, in the example of fig. 2, the back plate 100 and the light-equalizing diffusion plate 200 are both rectangular, and the side wall plates 300 surrounding the back plate 100 and the light-equalizing diffusion plate 200 also have four corresponding side wall plates 300, and the four side wall plates 300 are correspondingly disposed on each edge of the back plate 100 and the light-equalizing diffusion plate 200, it should be noted that, in the embodiment of the present invention, the shapes of the back plate 100 and the light-equalizing diffusion plate 200 are not limited to the rectangular, and the worker can set the shapes of the back plate 100 and the light-equalizing diffusion plate 200 according to actual needs, for example: triangle-shaped, polygon etc. set up the quantity of the side wall board 300 around backplate 100 and light-uniforming diffuser plate 200 and also can set for according to backplate 100 and light-uniforming diffuser plate 200's specific shape, the embodiment of the utility model provides a do not specifically limit to this.
In the embodiment of the present invention, a side light bar 310 is disposed on a side of the side wall plate 300 close to the back plate 100, and a back light bar 110 is correspondingly disposed on a side of the back plate 100 facing the light equalizing diffusion plate 200, in the example of fig. 2, the specific structure formed among the back plate 100, the light equalizing diffusion plate 200 and the side wall plate 300 can be regarded as a backlight lamp box with a cavity, and the side light bar 310 disposed on the side wall plate 300 and the back light bar 110 disposed on the back plate 100 are correspondingly located inside the backlight lamp box, during the specific use process, the light beam emitted from the side light bar 310 disposed on the side wall plate 300 can increase the brightness around the backlight lamp box, so that the brightness around the backlight lamp box approaches the brightness of the central position, and the light beams emitted from the back light bar 110 and the side light bar 310 are illuminated through the light equalizing diffusion plate 200, so that the light beam is, the uniformity of the light beam is increased.
In order to further improve the brightness of the light beam emitted by the backlight lamp box described in this embodiment, as shown in fig. 3, the backlight lamp box further includes a brightness sensor 500, a compensation circuit, and a backlight power supply 700.
Specifically, the luminance sensor 500 is disposed on a side of the sidewall plate 300 away from the side light bar 310, and the luminance sensor 500 is mainly used for detecting the luminance of the light beam emitted from the backlight lamp box and outputting a luminance voltage accordingly, the compensation circuit includes a digital comparator H1 and a controller 600, the digital comparator H1 has a first input end for receiving a reference voltage V0, a second input end connected to the luminance sensor 500 for receiving the luminance voltage, and an output end for outputting a control voltage when the reference voltage V0 is higher than the luminance voltage, and the controller 600 controls the backlight power supply 700 to respectively increase the luminance of the back light bar 110 and the side light bar 310 in response to the control voltage.
When the backlight lamp box is used for working, the brightness sensor 500 detects the brightness of the light beam emitted by the backlight lamp box in real time and generates a corresponding brightness voltage, the compensation circuit is connected with the brightness sensor 500, whether the brightness of the light beam emitted by the current backlight lamp box meets the preset brightness is judged according to the comparison result of the brightness voltage output by the brightness sensor 500 and the reference voltage V0, when the reference voltage V0 is higher than the brightness voltage, the brightness of the backlight lamp box does not meet the preset brightness, and the controller 600 controls the backlight power supply 700 to respectively improve the brightness of the back light bar 110 and the side light bar 310, so that the brightness of the backlight lamp box reaches the preset brightness, and the brightness compensation effect on the backlight lamp box is achieved.
In the embodiment, the backlight power supply 700 increases the brightness of the light beams emitted from the back light bar 110 and the side light bar 310 mainly by increasing the output current, so that the brightness of the backlight light box reaches the preset brightness.
It should be noted that in this embodiment, the controller 600 may be an element or a device having a control function, and in an example of this embodiment, the controller 600 includes an MCU singlechip.
In a preferred implementation manner of this embodiment, the method further includes:
the alarm device 800, the alarm device 800 is electrically connected with the controller 600;
wherein the controller 600 is responsive to the control voltage to control the alarm device 800 to alarm.
Here, the alarm device 800 may be an audible alarm or a light alarm, and the alarm device 800 is electrically connected to the controller 600, and when the reference voltage V0 is higher than the brightness voltage, then it indicates that the brightness of the light beam emitted from the backlight lamp box does not meet the preset brightness, at this time, the alarm device 800 can give corresponding alarm to remind the worker, when the current brightness is not up to standard, and after the controller 600 compensates the brightness of the light beam emitted from the backlight lamp box, under normal conditions, when the brightness of the backlight lamp box reaches the preset brightness, the alarm device 800 stops alarming, under abnormal conditions, the brightness of the backlight lamp box does not reach the preset brightness, the alarm device 800 does not stop alarming, at this time, it can be determined that there may be a corresponding problem with the device, resulting in the luminance of the backlight lamp box not being compensated to the corresponding preset luminance, and the worker can also perform corresponding inspection on the backlight lamp box based on this.
Because the brightness value of the backlight lamp box comprises the central brightness value and the peripheral brightness value of the backlight lamp box, and because of the light condensation principle, the brightness value at the center of the backlight lamp box is always far higher than the peripheral brightness value, the uniformity of the backlight lamp box is low.
In order to solve this problem, in this embodiment, a method of uniformity adjustment may be used to adjust the backlight box accordingly, specifically, the method includes the following steps: firstly, the back light bar 110 on the back plate 100 is powered on, the side light bar 310 on the side wall plate 300 is kept in a closed state, then, the central brightness value and the peripheral brightness value of the backlight light box are respectively measured by an optical instrument, the difference between the central brightness value and the peripheral brightness value is calculated, finally, the adjusting brightness value of the side light bar 310 is set according to the difference, the controller 600 controls the backlight power supply 700 to output the adjusting current corresponding to the adjusting brightness value to the side light bar 310 based on the adjusting brightness value, so that the difference between the peripheral brightness value and the central brightness value of the backlight light box does not exceed a preset threshold, and the specific value of the preset threshold can be set by a worker.
That is to say, in the present embodiment, the difference between the peripheral brightness values and the central brightness value of the backlight lamp box can be kept within a certain range by adjusting the brightness of the side light bar 310, so as to ensure that the difference between the peripheral brightness values and the central brightness value is not too large, thereby achieving the purpose of adjusting the uniformity of the backlight lamp box.
In a preferred implementation manner of this embodiment, in order to achieve fast adjustment of the backlight lamp box, corresponding tests may be performed in advance to obtain adjusted brightness values of the side light bars 310 corresponding to brightness values of different groups of back light bars 110, and the multiple groups of data are stored in the memory, so that in a subsequent use process, when the backlight lamp box needs to be uniformly adjusted, only the brightness value of the back light bar 110 of the backlight lamp box needs to be obtained, the controller 600 may adjust the adjusted brightness value of the side light bar 310 corresponding to the brightness value of the back light bar 110 stored in the memory in advance according to the brightness value of the back light bar 110, and control the backlight power supply 700 to output an adjusted current corresponding to the adjusted brightness value to the side light bar 310 based on the adjusted brightness value, thereby achieving the purpose of fast adjustment.
In the example of fig. 4, the sidewall plate 300 is provided with corresponding sidewall screw holes 320, the back plate 100 is provided with screw holes corresponding to the sidewall screw holes 320, the sidewall plate 300 and the back plate 100 can be fixed correspondingly by bolts, in addition, the sidewall plate 300 is further provided with corresponding clamping grooves 330, and the light-equalizing and diffusing plate 200 is clamped with the sidewall plate 300 through the clamping grooves 330.
In the example of fig. 5, the side light bar 310 includes:
a side substrate 311; and
and a plurality of side lamp beads 312 disposed on the side substrate 311.
Accordingly, in the example of fig. 6, back light bar 110 includes:
a back substrate 111; and
a plurality of back beads 112 disposed on the back substrate 111.
Specifically, in the embodiment of the present invention, the side substrate 311 and the back substrate 111 can be PCB substrates, and more preferably, in order to improve the heat dissipation effect, the PCB substrate can be made of aluminum, as shown in fig. 5, the side beads 312 disposed on the side substrate 311 can be arranged in two strings, and as shown in fig. 6, the back beads 112 disposed on the back substrate 111 can be arranged in a matrix manner, where the back beads 112 on the back substrate 111 are closely arranged in a matrix manner, so that the brightness of the central position of the backlight box can reach above 50000 candela (cd/m2), it should be noted that, in the embodiment of the present invention, the arrangement manner of the side beads 312 and the back beads 112 is not limited to the arrangement manner, and the worker can set the arrangement manner of the side beads 312 and the back beads 112 according to the actual requirement, the embodiment of the present invention is not limited to this embodiment.
In the embodiment of the present invention, on the one hand, in order to realize the fixation between lateral light bar 310 and lateral wall plate 300, the adhesive tape is pasted at the back of lateral light bar 310 by the accessible, make lateral light bar 310 and lateral wall plate 300 carry out fixed connection through the adhesive tape, in addition, in order to improve the heat dissipation effect, the adhesive tape can be selected for use and used as the heat conduction adhesive tape, on the other hand, in order to realize the fixation between back light bar 110 and backplate 100, in the example of fig. 2, backplate 100 screw hole can be set up on backplate 100, correspondingly set up base plate screw hole 113 on back light bar 110, and is further, pass backplate 100 screw hole and base plate screw hole 113 simultaneously through the bolt and realize the fixation between backplate 100 and back light bar 110.
Back lamp pearl 112 and lateral part lamp pearl 312 can adopt the colour temperature at the well power LED lamp pearl between 5500K ~ 6500K, and the LED lamp pearl of this colour temperature interval can send positive white light, can improve the luminance of lamp house in a poor light on the one hand, and on the other hand can control the bulk temperature of lamp house in a poor light, and, in the embodiment of the utility model, back lamp pearl 112 and lateral part lamp pearl 312 can adopt luminous angle to be 120 LED lamp pearl, and the light diffusion scope of the LED lamp pearl that adopts this emission angle is great, has the homogeneity that the light beam is improved to the useful use.
In the embodiment of the present invention, the backlight module further includes a power supply line, as shown in fig. 2 and fig. 4, a power supply line hole 130 is disposed on the back plate 100, a power supply line hole 130 is also disposed on the back substrate 111, after one end of the power supply line is electrically connected to the backlight source 700, the other end of the power supply line can pass through the power supply line hole 130 to be electrically connected to the side light bar 310 and the back light bar 110, respectively, so as to provide a corresponding power supply current for the side light bar 310 and the back light bar 110, and in the embodiment of the present invention, the backlight source 700 can supply power for the side light bar 310 and the back light bar 110 in a constant current manner, and accordingly change the brightness of the light beams emitted by the side light bar 310 and the.
More preferably, in order to solve the heat dissipation problem of the backlight lamp box of the embodiment of the present invention, in addition to adopting the PCB substrate of the side substrate 311 and the back substrate 111 as aluminum and selecting the adhesive tape for fixing between the side light bar 310 and the side wall plate 300 as the heat conductive adhesive tape, in the embodiment of the present invention, the following setting is further adopted, and finally the temperature of the backlight lamp box is controlled within 45 °.
(1) By arranging the heat dissipation silica gel on the back of the back light bar 110, the back light bar 110 is tightly attached to the back plate 100, so that the heat dissipation effect of the back light bar 110 is improved;
(2) as shown in fig. 4, a heat dissipation groove 340 is provided on the side wall plate 300, further increasing the heat dissipation area of the side wall plate 300300,
(3) as shown in fig. 1 and fig. 2, a heat dissipation plate 400 is disposed on a side of the backplate 100 away from the light-equalizing and diffusing plate 200, and it should be noted that a heat dissipation screw hole 410 is disposed on the heat dissipation plate 400, and a bolt can pass through the screw hole of the backplate 100 and the heat dissipation screw hole 410 simultaneously between the heat dissipation plate 400 and the backplate 100 to fix the backplate 100 and the heat dissipation plate 400.
To sum up, the backlight lamp box provided by the embodiment of the present invention can improve the brightness and uniformity of the light beam, in the specific using process, on one hand, the corresponding side light bar 310 is disposed on the side wall plate 300 to achieve the purpose of increasing the brightness around the backlight lamp box, so that the brightness around the backlight lamp box approaches the brightness of the central position, the light beam emitted by the back light bar 110 and the side light bar 310 is irradiated out through the light-equalizing diffusion plate 200 to make the light beam more uniform, and the uniformity of the light beam is increased, on the other hand, the brightness of the backlight lamp box is correspondingly adjusted through the corresponding coordination among the disposed brightness sensor 500, the backlight power supply 700 and the compensation circuit, so as to ensure that the brightness of the backlight lamp box is within the preset brightness range, thereby correspondingly improving the brightness of the backlight lamp box and improving the performance of the backlight lamp box, has wide application scenes.
Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it is obvious for those skilled in the art to make other variations or changes based on the above descriptions, and all the embodiments cannot be exhausted here, and all the obvious variations or changes that belong to the technical solutions of the present invention are still in the protection scope of the present invention.
Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it is obvious for those skilled in the art to make other variations or changes based on the above descriptions, and all the embodiments cannot be exhausted here, and all the obvious variations or changes that belong to the technical solutions of the present invention are still in the protection scope of the present invention.
Claims (10)
1. A backlight box, comprising:
a back plate;
the light-equalizing diffusion plate is arranged opposite to the back plate;
the side wall plates surround the back plate and the light-homogenizing diffusion plate, side light bars are arranged on one side, close to the back plate, of the side wall plates, and back light bars are arranged on one side, facing the light-homogenizing diffusion plate, of the back plate;
a brightness sensor;
a compensation circuit comprising a digital comparator and a controller; and
a backlight power supply;
the digital comparator is provided with a first input end, a second input end and an output end, the first input end is used for receiving a reference voltage, the second input end is connected with the brightness sensor to receive the brightness voltage, the output end is used for outputting a control voltage when the reference voltage is higher than the brightness voltage, and the controller responds to the control voltage to control the backlight power supply to respectively improve the brightness of the back light bar and the side light bar.
2. The backlight box of claim 1, further comprising:
the alarm device is electrically connected with the controller;
wherein the controller responds to the control voltage to control the alarm device to alarm.
3. The backlight lamp box of claim 1 or 2,
the controller comprises an MCU singlechip.
4. The backlight box of claim 1,
the backlight lamp also comprises a power supply line with one end electrically connected with the backlight power supply;
wherein, be provided with power supply line hole on the backplate, the other end of power supply line passes the power supply line hole respectively with lateral part lamp strip and back lamp strip electricity is connected.
5. The backlight box of claim 1,
and a heat dissipation plate is arranged on one side of the back plate, which is deviated from the light-equalizing diffusion plate.
6. The backlight box of claim 1,
the side wall plate is provided with a clamping groove, and the light-equalizing diffusion plate is clamped with the side wall plate through the clamping groove.
7. The backlight box of claim 1,
and the side wall plate is provided with a heat dissipation groove.
8. The backlight box of claim 1,
the side light bars are fixedly connected with the side wall plates through heat conducting adhesive tapes.
9. The backlight box of claim 1,
the side light bar includes:
a side substrate; and
and the side lamp beads are arranged on the side substrate.
10. The backlight box of claim 1,
the back light bar includes:
a back substrate; and
and the plurality of back lamp beads are arranged on the back substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020715099.4U CN212005316U (en) | 2020-04-30 | 2020-04-30 | Backlight lamp box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020715099.4U CN212005316U (en) | 2020-04-30 | 2020-04-30 | Backlight lamp box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212005316U true CN212005316U (en) | 2020-11-24 |
Family
ID=73409631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020715099.4U Active CN212005316U (en) | 2020-04-30 | 2020-04-30 | Backlight lamp box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212005316U (en) |
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2020
- 2020-04-30 CN CN202020715099.4U patent/CN212005316U/en active Active
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